Belt-driving mechanism.



J. W. CRYER 6: N. MANGNALL.

BELT DRIVING MECHANISM.

APPLICATION FILED SEPT. 20. 1 916.

3 SHEETSSHEET 1- Hi1. "Ill m: noun min on. mmuma. muumuruu. n. r.

J. W. CRYER & N. MANGNALL.

BELT DRIVING MECHANISM.

APPLICATION FILED SEPT. 20. I916.

Patented Jan. 14, 1919.

3 SHEETS-SHEET 2.

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I. W. CRYER & N. MANGNALL.

BELT DRIVING MECHANISM.

APPLICATION FILED SEPT. 20. I9l6.

1,291,426. Patented Jan. 14,1919.

3 SHEETS-SHEET 3.

UNITED STATES PATENT OFFICE.

JAMES WILFRED CRYER AND NATHAN MANG'NALL, 0F BOLTON, ENGLAND, ASSIGNORS T0 WILLIAM WADSWORTH AND SONS LIMITED, OF BOLTON, ENGLAND.

BELT-DRIVING- MECHANISM.

Specification of Letters Patent. Patented J an. 14, 1919.

Application filed September 20, 1916. Serial No. 121,308.

To all whom it may concern:

provement "in or Appertaining to Belt-Driv- ,ing Mechanism, of which the following description, having reference to the accompanying sheets a of drawmgs, 1s a specificatlon.

Our invention relates toirnprovements in or appertaining 'to 'belt dIlVHlg mechanism, particularlythat type used in connection with lifts orelevators. In this-type of aptionwiththesevera'l gates guarding the well of the'liffl for the purpose of preventing "the "raising or lowering of the-car BXCBPt WhBH all thegatesare' closed. However,',1t' has been possiblein connection with the usual chain and rod controlling means, to interfere with these loeking-devices'and for the attendant to cause'the traverse of the car .when one or more-ofthegates is'or are open, while'in-some cases the drivingbelts have not had transmitted-to them their full moveinen't'toentirely clear them of the fast pulley atsuch times asthey should occupy their respective positions-"upon the loose pulleys.

Fortlaese reasons many accidents have happened to the operators or users of lifts or elevators drivenand controlled by this type of 11180118111811]: 'Our present invention has for its object the application of electrieally controlled devices fortraversingathe driving belts from the fast to the loose pulleys, such controlling devicesbeing; soarranged that whenever either-of the driving'belts is-moved from-the fast pulley "such movement-is to its full extent or entirely clear-of the driving pulley, and Y that without being directly underthecontrol or the-direction of the at "tendant, or in other words the attendant the; same time that thedrivingbejlt'is shifted a brake is'autom'aticallyapplied to the driving pulley so as to arrest the motion of the car immediately. Our improvements are preferably used in combination-with safety devices for the doors of the well of the lift in order that the car cannot'be started into movement save when all the gates are closed, although we may if desired employ our electrical moving or controlling means for the driving belts .without any such safety appliances for the doors.

In order that our said invention may bereadily understood, we have hereunto appended sheets of drawings illustrative there of, to which, by figures and letters, reference is made in the following description Figure 1 is an elevation of our improvements as seen in the directionindicated by the arrow :0, Fig. 2, certain parts being broken away so that others may be more clearly seen.

Fig. 2 is a sectional elevation thereof taken on the line CD. a

Fig. 3 is a sectional plan of a portion of said apparatus taken on line A=B.

Fig. 4 is an end elevation of the brake operating bar and its weighted lever.

Fig 5 is a front elevation of said bar.

In carrying our invention into effect, we make use of any ordinary belt driving gear for the lift or hoist, but preferably that .wherein two loose pulleys 1, 2, and a fixed pulley 3are employed as shown by Fig. 1, these pulleys being mounted on a shaft in manner well known. Straight and crossed belts'are used in connection with the loose pulleys 1 and 2, and one or other of these driving belts is traversed on to the fixed pulley 3 by means of the belt fork a or b as desired, this reversing gear being old and well known. In Fig. 1 both of the driving belts 4, 5 are shown upon their respective loose pulleys 1 and 2. The belt forks a, b, are carried respectively by the plates 72 formed or fixed upon brackets (1 b, which are fixed upon the slidable shafts 0 and 0 their forked or guiding ends a 6 fitting respectively over the shafts or rods d, (Z The bar c isadjustably connectedto thebell-crank lever f fulcrumed at f upon the framework F, this lever being connected by the rod 72. with the core ofthe solenoid m, thelatter of which is also supported by said framework F.

The rod 0 is connected to the bell crank lever f fulcrumed at f on the framework F the rod 72. connecting said lever f with the core k of the solenoid m It will be seen that on an electrical circuit being completed which includes the solenoid m, the core 70 will, by the aforesaid connections, cause the rod 0 to traverse horizontally and carry the belt 4 from the loose pulley 1 to the fixed pulley 3, while on a circuit being completed through the solenoid m the rod 0 is similarly caused to move the driving belt 5 from the loose pulley 2 to the fixed pulley 3. Counterbalancing means, such as weights a return the cores 70 k levers 7", f and the belt forks a and b to their normal positions as shown by Fig. 1 immediately on the breaking of the respective circuits, and this movement will cause the belt to be moved fully on to its respective loose pulley without further control by the attendant. The lever f has a rod 0 connected thereto by a pin and slot f", said rod extending to a lever '9" and another rod 0 extends from the lever to a similar lever at the opposite side of the apparatus, both of these levers being connected to the bar 8 which swivels in bearings s 8 The bar 8 has lugs 8 extending from it through which takes a pin .9 having loosely mounted thereon the brake-shoe t, which is shown in contact with the driving pulley 3 in Fig. 2.

It will be seen that when either of the levers f or f is moved by the solenoid m or m the rod 0 or 0 causes an oscillation of the bar 8, thus moving the brake-shoe .15 away from the driving pulley 3, this movement of the brake shoe taking place at the end of the movement of the levers f or f because of the pin and slot connection f.

Suitable levers or arms provided with weights at are carried by the levers 1' con nected to the rod 8 by which the brake-shoe t is forced firmly into contact with said driving pulley 3 when either the belt guide a or b is returned by its respective counterbalancing weight or spring to its normal position illustrated by Fig. l. The brake-shoe 25 and bar 8 are mounted to intervene between the upper and lower parts of the driving belts as shown by Fig. 2.

Any appropriate switch devices maybe employed to close either of the circuits containing the solenoids m or m by which the core may be caused to ascend r descend and the driving belt will remain on the fixed pulley3 so long as the attendant keeps the switch 7 (which may be termed the car switch) in its closedfposition. However, immediately he releases same and breaks the circuit one of the weights n will move the .drivingbelt on to its respective loose pulley without any intervention on the part of: the operator, at the same time the weighted lever u will apply the-brake t to the fixed pulley Such being the nature and object of our said invention what we claim is 1. An improvement in belt driving mechanisms comprising a slidable shaft, a belt shifting device attached to said shaft, a bell crank lever having one arm connected with.

one end of said shaft and the other arm provided with means for maintaining the bell crank lever in a predetermined position, and electromagnetic means connected with the last mentioned arm of the bell crank lever for moving and holding said lever away from said predetermined position.

2. An improvement inbelt driving mechanisms comprising aslidable shaft, a belt shifting device attached to said shaft, a bell crank lever, means for adjustably'c0nnecting one arm of said lever with one end of said shaft, a weight on the other arm of said bell crank lever for maintaining the latter in a predetermined position, and electro-magnetic means connected with the weighted arm of the bell crank lever for moving and holding said lever away from said predetermined position.

3. An improvement in belt driving mechanisms comprising a slidable shaft, a belt shifting device attached to said shaft, a bell crank lever having one arm connected with one end of said shaft and the other arm provided with means for maintaining the bell crank lever in a predetermined position, and electromagnetic means connected with the last mentioned arm of the bell crank lever for moving and holding said lever away from said predetermined position, a brake, and means connecting the brake and the bell crank lever. F v

4. An improvement in belt driving mechanisms comprising a slidable shaft, a belt shifting'device attached to said shaft, a bell crank lever having one arm connected with one end of said shaft and the other arm provided with means for maintaining the bell crank lever in a predetermined position, and electromagnetic means connected with the last mentioned arm of the bell crank lever for moving and holding said lever away from said predetermined position, a brake, and an arm projecting from the bell crank-lever and having a lost motion connection'with said brake.

5. An improvement in belt driving mechmaintaining the belt shifting device in preanisms comprising a pair of slidable shafts, determined positions, and electromagnetic belt shifting devices, one for each shaft, means for moving the shafts to actuate the 10 each belt shifting device having means by belt shifting devices.

5 which it is attached to its shaft and means by which it is guided by the other shaft, JAMES WILFRED CRYER. means engaging the respective shafts for NATHAN MANGNALL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0." 

